New exhaust manifold for GM/Chevy 305 cu. in. and 350 cu. in. V8 marine gas engines. This is a direct replacement for many center-rise Barr, Indmar, Mastercraft, and Marine Power exhaust manifolds, and is compatible with any of my Indmar risers. Compare your casting numbers to the cross-reference below. This manifold comes with a full gasket and bolt kit. It will fit either side of the engine. Each purchase is for one manifold.

Riser mating bolt dimensions are 4" (101.6mm) by 2-5/8" (66.7mm) bolt center-to-center.

This part is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current part for casting numbers and match them to the cross reference below:

Cross Reference	Part Number
Marine Power	0994-000
Indmar	53-1027
Osco Motors	994
Barr Marine	CHV-1-83
Sierra Marine	18-1997-1
Aqua Power	5517
GLM Products	56230

Note: This manifold does not replace Indmar 53-1051, which has longer exhaust ports that space the manifold out further from the head. This only replaces Indmar 53-1027. To determine what you have, measure from the top of an exhaust port to the inner side of the manifold. If it measures approximately 1 inch, you have the more common manifold that this replaces. If it measured approximately 1.5 inches, you have the manifold with longer ports that this does not replace.

About Sierra
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

Share this product:
PinterestTwitterFacebook